Abstract: We take different Rhizophora stylosa communities as the object of study in Techeng Island,and use the mingling,health index,neighborhood comparison,competition index,neighborhood pattern and spatial density index to analyze and compare the spatial structures of different Rhizophora stylosa communities.The results show that the second community is a highly mixed,the first community and the third one belongs to moderately mixed forest,the forth community is pure forest; the DBH neighborhood comparison of the forth community is the least.The tree height neighborhood comparison of the first community is the least.All the communities are greater than 0.517 in the stand spatial distribution pattern,which is slug distribution.Rhizophora stylosa and Bruguiera gymnorrhiza mixed community health is better than pure mangrove community.Pure Rhizophora stylosa community competition index minimum is in a dominant position.The three community average spatial density index is smaller than other communities and growth is better.

Key words: Rhizophora stylosa, spatial structure, mangrove, Techeng Island